When calling the addRoutePattern AXL API I get back the following SOAP response:
ENUM for TRUE not found in TypeStatus
I'm not sure what it's referring to as TypeStatus isn't a Key mentioned in the API documentation.
I resolved this. "useCallingPartyPhoneMask"=>"On" On is the valid answer not TRUE. When in doubt build it by hand then use the Get API call to parse the result.